Modelling may not be brain surgery, as J K Rowling pointed out last week when she pilloried "empty-headed toothpicks", but it seems that brain surgeons can be models.Megan McGill, a well-travelled American fashion model with a degree in neuroscience, yesterday defended her trade against the author's scathing criticism. She said she was appalled by the confrontational nature of Miss Rowling's comments, adding: "You are the most loved woman by every child in the world, how can you be so bitter?" Miss McGill, who is based in London but will move to New York in the autumn to study neurology at...